Home > Fittings > Stainless Steel Union
Weston Stainless is one of the top manufacturers and exporters of high-quality stainless steel products, with humble beginnings in Midland, UK. With years of experience spanning over a century of excellence and commitment Weston Stainless offers premium solutions to industrial, commercial and specialty applications. Dedicated to reputation for durability, corrosion protection and accurate design, the company specializes in providing stainless steel unions, fittings and parts of custom specifications based on diversified industry requirements. Relied on throughout the UK and worldwide, Weston Stainless combines cutting-edge technology with top-class customer service to provide reliable and budget-friendly stainless steel solutions, thus becoming a reliable partner in the stainless steel union industry.
Stainless steel unions are pipe fittings used to connect and disconnect piping sections easily without causing deformation. They are usually manufactured from stainless steel grades of 304, 316, or 321 comprising chromium (about 18%) and nickel (8–10%) for corrosion resistance, plus additions of molybdenum for increased durability. These alloys possess excellent mechanical properties like high tensile strength (typically 515–620 MPa) ductility and toughness even at low temperatures. They resist oxidation, withstand high pressure and offer long service life under unfavorable environments and hence are ideal for use in chemical, petrochemical and food processing industries.
| Dimensions | ASME 16.11, MSS SP-79, MSS SP-95, 83, 95, 97, BS 3799 |
| Size | 1/8″ NB TO 4″ NB |
| Form | Threaded Union, Forged Threaded Union |
| Pressure Ratings | Up to 20,000 psig (1,378 bar) |
|---|---|
| Temperature Ratings | Up to 1000° F (537° C) |
| Class | 33000 LBS, 6000 LBS, 4500 LBS |
| Type | Socket Weld (S/W) & SCREWED (SCRD) – NPT, BSP, BSPT |
| Types | NPT, ISO/BSP, SAE threads |
| Value Added Services: | Hot Dipped Galvanizing, Epoxy & FBE Coating, Electro Polish, Sand Blasting, Threading, Soldering |
| Export to | Singapore, Indonesia, Midland, Brazil, Ukraine, India, Thailand, Korea, Oman, Spain, Canada, USA, Ireland, Iran, Egypt, Saudi Arabia, Peru, etc |
| Production Grades: | Stainless Steel, Alloy Steel, Duplex, Nickel Alloys, Low temperature Steel, Carbon Steel, Cupro Nickel |
| Sizes available | 1/16 to 1 in. |
| Main Types | Pipe nipples, adapter and gaskets, reducing bushing and reducers, couplings, elbows, tees, crosses, union ball joints, caps, and plugs |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Ti | Fe | |
| 304 | min. | 18.0 | 8.0 | |||||||||
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||||
| 304L | min. | 18.0 | 8.0 | |||||||||
| max. | 0.030 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 12.0 | 0.10 | ||||
| 304H | min. | 0.04 | 18.0 | 8.0 | ||||||||
| max. | 0.010 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | |||||
| SS 310 | 0.015 max | 2 max | 0.015 max | 0.020 max | 0.015 max | 24.00 26.00 | 0.10 max | 19.00 21.00 | 54.7 min | |||
| SS 310S | 0.08 max | 2 max | 1.00 max | 0.045 max | 0.030 max | 24.00 26.00 | 0.75 max | 19.00 21.00 | 53.095 min | |||
| SS 310H | 0.04 0.10 | 2 max | 1.00 max | 0.045 max | 0.030 max | 24.00 26.00 | 19.00 21.00 | 53.885 min | ||||
| 316 | min. | 16.0 | 2.03.0 | 10.0 | ||||||||
| max. | 0.035 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0 | 14.0 | |||||
| 316L | min. | 16.0 | 2.03.0 | 10.0 | ||||||||
| max. | 0.035 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0 | 14.0 | |||||
| 316TI | 0.08 max | 10.00 14.00 | 2.0 max | 0.045 max | 0.030 max | 16.00 18.00 | 0.75 max | 2.00 3.00 | ||||
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 304/ 304L | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 | Psi 30000 , MPa 205 | 35 % |
| 304H | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 | Psi 30000 , MPa 205 | 40 % |
| 310 / 310S / 310H | 7.9 g/cm3 | 1402 °C (2555 °F) | Psi 75000 , MPa 515 | Psi 30000 , MPa 205 | 40 % |
| 306/ 316H | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 | Psi 30000 , MPa 205 | 35 % |
Contact us to get a quick quote for your requirement.
In addition, Weston Stainless Unions are accompanied by required test certificates, including Material Test Certificate (MTC) as per EN 10204/3.1b, Positive Material Identification (PMI) Test Certificate, 100% Radiography Test Report, and Third-Party Inspection Certificate. These certificates prove the quality, reliability, and high performance and durability of the product. This guarantees users a smooth and reliable experience, with Stainless Steel Unions with the highest possible quality and conformity.
Stainless Steel Unions typically do not require additional corrosion protection coatings due to their inherent resistance to rust and corrosion. However, coatings may be applied for extreme environments or aesthetic purposes.
When selecting Stainless Steel Unions, consider factors like material grade, pressure ratings, size compatibility, corrosion resistance, and the specific application environment to ensure optimal performance and durability.
Yes, Stainless Steel Unions are fully recyclable. Stainless steel is a sustainable material that can be reused without losing its properties, making it an environmentally friendly choice for various applications.
Stainless Steel Unions are available in various configurations, including threaded, butt-weld, socket-weld, and flanged unions, offering different connection types to suit diverse industrial applications and pressure requirements.
Stainless steel unions are widely used in piping systems to connect and disconnect pipes without deforming. They are specifically used in applications requiring frequent maintenance or replacement of components. Corrosion, pressure and temperature resistant, they are ideal for use in industries such as chemical processing, food and beverage pharmaceuticals and oil and gas. The unions offer leak-tight threads, improve durability, and make assembly and disassembly easy. Stainless steel unions also remain clean, and therefore they are employed in sanitary uses. Their long life, reuse possibilities, and simplicity of installation contribute towards greater efficiency and reduced downtime in most industrial and commercial operations.
©2024 Weston Stainless All Rights Reserved.
